Is it possible for the ATF to rule that only certain versions of the S12 (pistol gripped, for example) are subject to new regulations?

Also, what are the likely possibilities for the S12? Are ATF considering banning importation, or are more draconian possibilities like requiring it to be registered as a "destructive device" more likely?

Lastly, if it becomes a "DD," what happens for those who live in CA, where DDs aren't legal?